package com.bitejiuyeke.forum.services.impl;

import com.bitejiuyeke.forum.common.AppResult;
import com.bitejiuyeke.forum.common.ResultCode;
import com.bitejiuyeke.forum.dao.ArticleMapper;
import com.bitejiuyeke.forum.exception.ApplicationException;
import com.bitejiuyeke.forum.model.Article;
import com.bitejiuyeke.forum.model.Board;
import com.bitejiuyeke.forum.model.User;
import com.bitejiuyeke.forum.services.IArticleService;
import com.bitejiuyeke.forum.services.IBoardService;
import com.bitejiuyeke.forum.services.IUserService;
import com.bitejiuyeke.forum.utils.StringUtil;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Service;


import javax.annotation.Resource;
import java.util.Date;
import java.util.List;


@Slf4j
@Service
public class ArticleServiceImpl implements IArticleService {

    @Resource
    private ArticleMapper articleMapper;

    //用户和板块的操作
    @Resource
    private IUserService userService;
    @Resource
    private IBoardService boardService;

    @Override
    public void create(Article article) {
        //非空校验
        if (article == null  || article.getUserId() == null  || StringUtil.isEmpty(article.getTitle())
        || StringUtil.isEmpty(article.getContent()) || article.getBoardId() == null) {
            //打印日志
            log.warn(ResultCode.FAILED_PARAMS_VALIDATE.toString());
            //抛出异常
            throw new ApplicationException(AppResult.failed(ResultCode.FAILED_PARAMS_VALIDATE));
        }

        //设置默认值
        article.setVisitCount(0);  //访问数
        article.setReplyCount(0);   //回复数
        article.setDeleteState((byte)0);   //点赞数
        article.setState((byte)0);
        Date date = new Date();
        article.setCreateTime(date);
        article.setUpdateTime(date);

        //写入数据库
        int articleRow = articleMapper.insertSelective(article);
        if (articleRow <= 0) {
            log.warn(ResultCode.FAILED_CREATE.toString());
            throw new ApplicationException(AppResult.failed(ResultCode.FAILED_CREATE));
        }

        User user = userService.selectById(article.getUserId());  //获取用户信息
        //没有获取到用户信息
        if (user == null) {
            log.warn("{}, 发帖失败, user id = {}", ResultCode.FAILED_CREATE.toString(), article.getUserId());
            throw new ApplicationException(AppResult.failed(ResultCode.FAILED_CREATE));
        }
        //更新用户的发帖数
        userService.addOneArticleCountById(user.getId());
        //获取板块信息
        Board board = boardService.selectById(article.getBoardId());
        //是否在数据库中有对应的板块
        if (board == null) {
            log.warn("{}, 发帖失败, board id = {}", ResultCode.FAILED_CREATE.toString(), article.getBoardId());
            throw new ApplicationException(AppResult.failed(ResultCode.FAILED_CREATE));
        }

        //更新板块中的帖子数量
        boardService.addOneArticleCountById(board.getId());


        //打印日志
        log.info("{}, user id = {}, board id = {}, article id = {}发帖成功", ResultCode.SUCCESS.toString(), article.getUserId(), board.getId(), article.getId());

//        throw new ApplicationException(AppResult.failed("测试事务回滚"));
    }


    @Override
    public List<Article> selectAll() {
        List<Article> articles = articleMapper.selectAll();
        return articles;
    }

    @Override
    public List<Article> selectAllByBoardId(Long boardId) {

        //非空校验
        if (boardId == null || boardId <= 0) {
            //打印日志
            log.warn(ResultCode.FAILED_PARAMS_VALIDATE.toString());
            //抛出异常
            throw new ApplicationException(AppResult.failed(ResultCode.FAILED_PARAMS_VALIDATE));
        }
        //校验一下板块是否存在
        Board board = boardService.selectById(boardId);
        if (board == null) {
            log.warn("{}, board id = {}", ResultCode.FAILED_BOARD_NOT_EXISTS.toString(), boardId);
            throw new ApplicationException(AppResult.failed(ResultCode.FAILED_BOARD_NOT_EXISTS));
        }

        //调用DAO  查询
        List<Article> articles = articleMapper.selectAllByBoardId(boardId);
        return articles;
    }

    @Override
    public List<Article> selectByUserId(Long userId) {
        //非空校验
        if (userId == null || userId <= 0) {
            //打印日志
            log.warn(ResultCode.FAILED_PARAMS_VALIDATE.toString());
            //抛出异常
            throw new ApplicationException(AppResult.failed(ResultCode.FAILED_PARAMS_VALIDATE));
        }

        //校验用户是否存在
        User user = userService.selectById(userId);
        if (user == null) {
            log.warn("{}, user id = {}", ResultCode.FAILED_USER_NOT_EXISTS.toString(), userId);
            throw new ApplicationException(AppResult.failed(ResultCode.FAILED_USER_NOT_EXISTS));
        }
        //调用DAO
        List<Article> articles = articleMapper.selectByUserId(userId);
        //返回结果
        return articles;
    }

    @Override
    public Article selectDetailById(Long id) {
        //非空校验
        if (id == null || id <= 0) {
            //打印日志
            log.warn(ResultCode.FAILED_PARAMS_VALIDATE.toString());
            //抛出异常
            throw new ApplicationException(AppResult.failed(ResultCode.FAILED_PARAMS_VALIDATE));
        }

        //调用DAO
        Article article = articleMapper.selectDetailById(id);
        //判断结果是否为空
        if (article == null) {
            log.warn(ResultCode.FAILED_ARTICLE_NOT_EXISTS.toString());
            //抛出异常
            throw new ApplicationException(AppResult.failed(ResultCode.FAILED_ARTICLE_NOT_EXISTS));

        }

        //更新帖子的访问次数
        Article updateArticle = new Article();
        updateArticle.setId(article.getId());
        updateArticle.setVisitCount(article.getVisitCount() + 1);
        //保存在数据库
        int row = articleMapper.updateByPrimaryKeySelective(updateArticle);
        if (row != 1) {
            log.warn(ResultCode.ERROR_SERVICES.toString());
            //抛出异常
            throw new ApplicationException(AppResult.failed(ResultCode.ERROR_SERVICES));
        }
        //为返回的对象 进行数据更新    更新访问次数
        article.setVisitCount(article.getVisitCount() + 1);
        return article;
    }

    @Override
    public Article selectById(Long id) {
        //非空校验
        if (id == null || id <= 0 ) {
            //打印日志
            log.warn(ResultCode.FAILED_PARAMS_VALIDATE.toString());
            throw new ApplicationException(AppResult.failed(ResultCode.FAILED_PARAMS_VALIDATE));
        }

        //调用DAO
        Article article = articleMapper.selectByPrimaryKey(id);
        //返回结果
        return article;
    }

    @Override
    public void modify(Long id, String title, String content) {
        //非空校验
        if (id == null || id <= 0 || StringUtil.isEmpty(title)
         || StringUtil.isEmpty(content)) {
            //打印日志
            log.warn(ResultCode.FAILED_PARAMS_VALIDATE.toString());
            throw new ApplicationException(AppResult.failed(ResultCode.FAILED_PARAMS_VALIDATE));
        }


        //构建要更新的帖子对象
        Article updateArticle = new Article();
        updateArticle.setId(id);  //id
        updateArticle.setTitle(title);  //标题
        updateArticle.setContent(content);  //内容
        updateArticle.setUpdateTime(new Date());  //更新时间
        //调用DAO
        int row = articleMapper.updateByPrimaryKeySelective(updateArticle);
        if (row != 1) {
            log.warn(ResultCode.ERROR_SERVICES.toString());
            throw new ApplicationException(AppResult.failed(ResultCode.ERROR_SERVICES));
        }
    }

    @Override
    public void thumbsUpById(Long id) {
        //非空校验
        if (id == null || id <= 0) {
            //打印日志
            log.warn(ResultCode.FAILED_PARAMS_VALIDATE.toString());
            throw new ApplicationException(AppResult.failed(ResultCode.FAILED_PARAMS_VALIDATE));
        }

        //获取帖子详情
        Article article = articleMapper.selectByPrimaryKey(id);
        //帖子不存在
        if (article == null || article.getDeleteState() == 1) {
            //打印日志
            log.warn(ResultCode.FAILED_ARTICLE_NOT_EXISTS.toString());
            throw new ApplicationException(AppResult.failed(ResultCode.FAILED_ARTICLE_NOT_EXISTS));
        }
        //帖子状态异常
        if ( article.getState() == 1 ) {
            //打印日志
            log.warn(ResultCode.FAILED_ARTICLE_BANNED.toString());
            throw new ApplicationException(AppResult.failed(ResultCode.FAILED_ARTICLE_BANNED));
        }

        //构造要更新的对象
        Article updateArticle = new Article();
        updateArticle.setId(article.getId());
        updateArticle.setLikeCount(article.getLikeCount() + 1);
        updateArticle.setUpdateTime(new Date());

        //更新数据库  调用DAO
        int row = articleMapper.updateByPrimaryKeySelective(updateArticle);
        if (row != 1) {
            log.warn(ResultCode.ERROR_SERVICES.toString());
            throw new ApplicationException(AppResult.failed(ResultCode.ERROR_SERVICES));
        }
    }

    @Override
    public void deleteById(Long id) {
        //非空校验
        if (id == null || id <= 0) {
            //打印日志
            log.warn(ResultCode.FAILED_PARAMS_VALIDATE.toString());
            throw new ApplicationException(AppResult.failed(ResultCode.FAILED_PARAMS_VALIDATE));
        }
        //根据Id查询帖子信息
        Article article = articleMapper.selectByPrimaryKey(id);
        if (article == null || article.getDeleteState() == 1) {
            //打印日志
            log.warn(ResultCode.FAILED_BOARD_NOT_EXISTS.toString() + " , article id " + id);
            //抛出异常
            throw new ApplicationException(AppResult.failed(ResultCode.FAILED_BOARD_NOT_EXISTS));
        }
        //构造一个更新对象
        Article updateArticle = new Article();
        updateArticle.setId(article.getId());
        updateArticle.setDeleteState((byte)1);
        //调用DAO
        int row = articleMapper.updateByPrimaryKeySelective(updateArticle);
        if (row != 1) {
            log.warn(ResultCode.ERROR_SERVICES.toString());
            throw new ApplicationException(AppResult.failed(ResultCode.ERROR_SERVICES));
        }

        //更新板块中的帖子数量
        boardService.subOneArticleCountById(article.getBoardId());
        //更新用户发帖数
        userService.subOneArticleCountById(article.getUserId());
        log.info("删除帖子成功, article id {}", article.getId() + ", user id {}", article.getUserId());
    }

    @Override
    public void addOneReplyCountById(Long id) {
        //非空校验
        if (id == null || id <= 0) {
            //打印日志
            log.warn(ResultCode.FAILED_PARAMS_VALIDATE.toString());
            throw new ApplicationException(AppResult.failed(ResultCode.FAILED_PARAMS_VALIDATE));
        }
        //获取帖子记录
        Article article = articleMapper.selectByPrimaryKey(id);
        if (article == null || article.getDeleteState() == 1) {
            log.warn(ResultCode.FAILED_ARTICLE_NOT_EXISTS.toString());
            throw new ApplicationException(AppResult.failed(ResultCode.FAILED_ARTICLE_NOT_EXISTS));
        }
        //帖子已经封帖
        if (article.getState() == 1) {
            log.warn(ResultCode.FAILED_ARTICLE_BANNED.toString());
            throw new ApplicationException(AppResult.failed(ResultCode.FAILED_ARTICLE_BANNED));
        }
        //构造更新对象
        Article updateArticle = new Article();
        updateArticle.setId(id);
        updateArticle.setReplyCount(article.getReplyCount() + 1);  // 回复数 +1
        updateArticle.setUpdateTime(new Date());
        //调用DAO  更新数据库
        int row = articleMapper.updateByPrimaryKeySelective(updateArticle);
        if (row != 1) {
            log.warn(ResultCode.ERROR_SERVICES.toString());
            throw new ApplicationException(AppResult.failed(ResultCode.ERROR_SERVICES));
        }
    }
}
